Expandable 4-port USB hub provides a convenient link to your USB compatible devices. Plugs directly into computer requiring no external power or software. High-speed 480 Mbps transfer speed saves time and increases productivity. Hot Pluggable/Expandable. Number of Ports: 4; For Use With: Multiple USB Devices To 1 Computer; Transfer Rate: 480 Mbps; Width: 3 1/4 in.